nlp_ie_9.py

# function to find sentences containing PMs of India
def find_names(text):
    
    names = []
    
    # spacy doc
    doc = nlp(text)
    
    # pattern
    pattern = [{'LOWER':'prime'},
              {'LOWER':'minister'},
              {'POS':'ADP','OP':'?'},
              {'POS':'PROPN'}]
                
    # Matcher class object 
    matcher = Matcher(nlp.vocab) 
    matcher.add("names", None, pattern) 

    matches = matcher(doc)

    # finding patterns in the text
    for i in range(0,len(matches)):
        
        # match: id, start, end
        token = doc[matches[i][1]:matches[i][2]]
        # append token to list
        names.append(str(token))
    
    # Only keep sentences containing Indian PMs
    for name in names:
        if (name.split()[2] == 'of') and (name.split()[3] != "India"):
                names.remove(name)
            
    return names

# apply function
df2['PM_Names'] = df2['Sent'].apply(find_names)

Hi, it should have been df2['Sent'] in the last line. I have made the changes, it should work now.